as in red light
something that tells of approaching danger or risk
the résumé she accidentally left on the office printer was a red flag that she was planning to quit
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Recent Examples of red flag
And perhaps the greatest example of emotion trumping logic came on challenge plays, as LaFleur went 1-6 when throwing his red flag.
—
Rob Reischel, Forbes.com, 23 July 2025
While red flags were posted on nearby sections of the beach, her lawsuit alleges the city should have known the entire area was unfit for swimming.
—Tresa Baldas, Freep.com, 21 July 2025
So the American dollar so far in 2025 falling in value by around 3 cents, or 5 percent, against the Canadian loonie due to the chaos around Trump’s global trade war is suddenly raising red flags as trends shift.
—Etan Vlessing, HollywoodReporter, 21 July 2025
Skeptics raise red flags Bitcoin's sharp rally has drawn caution from some corners of the market.
—Niket Nishant, USA Today, 12 July 2025
See All Example Sentences for red flag
Rob Reischel, Forbes.com, 23 July 2025
While red flags were posted on nearby sections of the beach, her lawsuit alleges the city should have known the entire area was unfit for swimming.
—Tresa Baldas, Freep.com, 21 July 2025
So the American dollar so far in 2025 falling in value by around 3 cents, or 5 percent, against the Canadian loonie due to the chaos around Trump’s global trade war is suddenly raising red flags as trends shift.
—Etan Vlessing, HollywoodReporter, 21 July 2025
Skeptics raise red flags Bitcoin's sharp rally has drawn caution from some corners of the market.
—Niket Nishant, USA Today, 12 July 2025
See All Example Sentences for red flag
Recent Examples of Synonyms for red flag
Noun
-
Derrick John Thompson was given consecutive sentences totaling nearly 59 years in prison Thursday for running a red light at more than 100 mph in south Minneapolis and crashing into a sedan, killing five young women.—
Nick Ferraro,
Twin Cities,
25 July 2025
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Then came the white Cadillac, creeping up beside them at a red light just off the Strip.—
Danielle Bacher,
People.com,
4 July 2025
Noun
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Parts of Northern Kentucky are under a severe thunderstorm warning until 8:30 p.m. as well.—
David Ferrara,
The Enquirer,
21 July 2025
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Nothing irritates cybersecurity professionals more than blanket warnings about public WiFi, given that most traffic to and from your smartphone is now encrypted.—
Zak Doffman,
Forbes.com,
20 July 2025
Noun
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That the account belonging to the president of the United States is now posting to the entire world like a Facebook Uncle, though, is a troubling sign.—
Charlie Warzel,
The Atlantic,
22 July 2025
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This could be a sign of a wider acceptance of cryptcurrency in the mainstream, some experts said.—
Medora Lee,
USA Today,
22 July 2025
Cite this Entry
“Red flag.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/red%20flag. Accessed 30 Jul. 2025.
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